When the fractured bone protrudes from the skin, this is known as a compound fracture.
Open fracture - a broken bone protudes through the skin or an external wound leads to a broken bone
An open compound fracture.
either complete dislocation if it's at a joint, or a compound fracture if the bone is broken
If you are trying to determine whether there is a broken bone you should not always expect a bone to be protruding. Some breaks can be extremely small.
Compound Fracture
It is called a compound or open fracture.
A fracture. May be of several types - ~Greenstick (partial/common in children) ~Comminuted-(basically shattered) ~Compound-(protruding out of the skin ) ~Simple-(not protruding out of the skin) ~Spiral-(around the bone) ~Transverse-(across the bone horizontally) ~Longitudinal-(long ways up a bone) ~Impacted-(broken ends wedged into one another)
A fracture for a broken bone. If the bone is broken badly enough to stick out through the skin it is called a compound fracture.
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Simple fracture vs. Compound Fracture (bone protrudes through skin)
There are two types of bone break where the bone is partially broken. One is called a simple fracture (also called a "greenstick fracture") the other is a hairline fracture.
Your heel is a bone called the calcaneous, and bones can certainly be broken. If you feel you have broken or cracked a bone, have your doctor X-ray it to be certain. They can give you a cast that you can walk on until the bone heals.